High triplet energy materials for efficient exciplex-based and full-TADF-based white OLEDs

Tan, Xiaofeng; Volyniuk, Dmytro; Matulaitis, Tomas; Keruckas, Jonas; Ivaniuk, Khrystyna; Helzhynskyy, Igor; Stakhira, Pavlo; Gražulevičius, Juozas V.

doi:10.1016/j.dyepig.2020.108259

Cited by 6 publications

(7 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Given the fact that exciplex radiation is characterized by a 'wide' band, which allows formation of highly efficient WOLEDs, we used 4′′-tris[phenyl(m-tolyl)amino] triphenylamine (m-MTDATA) [6,7] as a donor component of exciplex structure. The acceptor component was given by a material based on an ambipolar donor-acceptor molecule (diphenyl sulfone) as an acceptor, and xanthene as a donor fragment of the molecule P6 [8].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…It has recently been found that the energy and the quantum electroluminescence yield are fundamentally affected by triplet excitons participating in the process of thermally activated delayed fluorescence in organic donor-acceptor exciplex complexes [5,6]. The authors of the recent works [7,8] have reported on implementation of some technological approaches and design of device architecture, which have a positive impact on the efficiency and the lifetime of the devices. Combining these techniques can provide a white colour ranging from 'cold' to 'warm'.…”

Section: Introductionmentioning

confidence: 99%

“…Combining these techniques can provide a white colour ranging from 'cold' to 'warm'. Additional ultra-thin functional layers in the devices have been used to reduce energy barriers and luminescence quenching [7,8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electro-optic properties of double-type emission of organic electroluminescence device

Helzhynskyy¹,

Kutsiy²,

Albota³

2021

Ukr. J. Phys. Opt.

View full text Add to dashboard Cite

We study electroluminescence and impedance properties of a double-type white organic light-emitting device (WOLED) based on phosphorescent and thermally activated delayed fluorescence emissions in a single heterostructure. Current-voltage characteristics of the WOLED and impedance spectroscopy data are obtained for the layered and composite-layer devices. These results demonstrate that a combination of layer-based and composite-based technologies in a single heterostructure improves both the efficiency and the stability of WOLED heterostructures. Light-emission performance of the WOLED is also studied. The device reveals very good electroluminescence properties and colour coordinates as a white light source. Its maximal brightness is larger than 10 4 cd/m 2 and the maximal external quantum efficiency is larger than 12%.

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electro-optic properties of double-type emission of organic electroluminescence device

Helzhynskyy¹,

Kutsiy²,

Albota³

2021

Ukr. J. Phys. Opt.

View full text Add to dashboard Cite

show abstract

“… Guo et al (2020) reported a blue exciplex–based OLED based on N , N ′-bis(3-methylphenyl)- N , N ′-diphenylbenzidine (TPD):Bphen, which exhibited a relatively low EQE max of 0.46%, possibly resulting from the low PLQE of the exciplex. Tan et al (2020) designed and investigated a series of donor–acceptor–donor materials based on sulfone substituents as acceptors and found that one of these materials (P6) could form blue exciplexes with TCTA. The TCTA:P6-exciplex–based OLED showed a high EQE max of 9.1% and deep-blue emission with λ EL = 433 nm.…”

Section: Blue Exciplex–based Organic Light-emitting Materials and Dev...mentioning

confidence: 99%

“…Meanwhile, the T 1 level of the exciplex should also be higher than that of a phosphorescent dopant to guarantee the energy transfer from the exciplex to a blue dopant. Hence, it seems to be a challenging issue to attain an ideal exciplex system meeting these requirements ( Jung and Lee, 2020 ; Tan et al, 2020 ).…”

Section: Blue Exciplexes As Cohost Materials In Blue Phosphorescent O...mentioning

confidence: 99%

Advances in Blue Exciplex–Based Organic Light-Emitting Materials and Devices

Liu

et al. 2022

Front. Chem.

View full text Add to dashboard Cite

Exciplexes possessing thermally activated delayed fluorescence (TADF) characteristics have received much attention in the fields of organic light-emitting materials and devices over the past decade. In general, an exciplex is a physical mixture between a donor (D) with hole transport properties and an acceptor (A) with electron transport characteristics, and the energy difference between the lowest excited singlet state and the lowest excited triplet state is usually fairly small in terms of the long-range charge-transfer process from D to A. In the processes of photoluminescence and electroluminescence, triplet excitons can be converted to singlet excitons through reverse intersystem crossing and then radiate photons to achieve TADF. As a consequence, triplet excitons can be effectively harvested, and the exciton utilization can be significantly enhanced. Up to now, a large number of exciplexes have been developed and applied to organic light-emitting devices. Notably most of them showed green or red emission, while blue exciplexes are relatively few owing to the spectrum characteristics of the large red-shift and broadened emission. In this study, the latest progress of blue exciplex–based organic light-emitting materials and devices is briefly reviewed, and future research is prospected.

show abstract

Blocking energy-loss pathways for phosphorescent organic light emitting devices with novel exciplex-forming host

Liao

Liu

et al. 2020

Dyes and Pigments

View full text Add to dashboard Cite

High triplet energy materials for efficient exciplex-based and full-TADF-based white OLEDs

Cited by 6 publications

References 45 publications

Electro-optic properties of double-type emission of organic electroluminescence device

Electro-optic properties of double-type emission of organic electroluminescence device

Advances in Blue Exciplex–Based Organic Light-Emitting Materials and Devices

Blocking energy-loss pathways for phosphorescent organic light emitting devices with novel exciplex-forming host

Contact Info

Product

Resources

About